Therefore, put aside the intellectual practice of investigating words and chasing phrases, and learn to take the backward step that turns the light and shines it inward. Body and mind of themselves will drop away, and your original face will manifest. If you want to realize such, get to work on such right now.
For practicing Zen, a quiet room is suitable. Eat and drink moderately. Put aside all involvements and suspend all affairs. Do not think "good" or "bad." Do not judge true or false. Give up the operations of mind, intellect, and consciousness; stop measuring with thoughts, ideas, and views. Have no designs on becoming a Buddha. How could that be limited to sitting or lying down?
At your sitting place, spread out a thick mat and put a cushion on it. Sit either in the full-lotus or half-lotus position. In the full-lotus position, first place your right foot on your left thigh, then your left foot on your right thigh. In the half-lotus, simply place your left foot on your right thigh. Tie your robes loosely and arrange them neatly. Then place your right hand on your left leg and your left hand on your right palm, thumb-tips lightly touching. Straighten your body and sit upright, leaning neither left nor right, neither forward nor backward. Align your ears with your shoulders and your nose with your navel. Rest the tip of your tongue against the front of the roof of your mouth, with teeth together and lips shut. Always keep your eyes open, and breathe softly through your nose.
Once you have adjusted your posture, take a breath and exhale fully, rock your body right and left, and settle into steady, immovable sitting. Think of not thinking. Not thinking-what kind of thinking is that? Nonthinking. This is the essential art of zazen.
The zazen I speak of is not meditation practice. It is simply the dharma gate of joyful ease, the practice-realization of totally culminated enlightenment. It is the koan realized; traps and snares can never reach it. If you grasp the point, you are like a dragon gaining the water, like a tiger taking to the mountains. For you must know that the true dharma appears of itself, so that from the start dullness and distraction are struck aside.